Meteorites   View all facts   Glossary   Help

rock > igneous rock > differentiated meteorite > metal-rich meteorite > stony iron meteorite > pallasite > main group pallasite > Brenham

Brenham
subject			fact

Brenham	has image
	is an instance of meteorite find
	is an instance of main group pallasite
	has name Brenham
	has find date 1882
	has fall coordinates 37° 36' N., 99° 12' W.
	has fall location Kiowa County, Kansas
	has mass 1.5 tons
	has weathering stage extreme
	has olivine crystal distribution heterogeneous some regions have no olivine crystals
	has image
	has image
	has image
	has image
	has image
	has image
	has image
	has image
	has image
	has image
	has image
	has image
	has image
	has image
	has image
meteorite find	has value lower because the fall was not witnessed
	has weathering can be severe due to long exposure time to environmental corrosion agents
main group pallasite	has olivine composition Fo 88+-1
	has olivine composition uniformity heterogeneous elements are zoned between grain rim and core
	has minor mineral troilite
	has minor mineral schreibersite
	has troilite content 0.1 to 7.3 % by volume
	has schreibersite content 0.3 to 2.8 % by volume
meteorite	has fall date recorded by eyewitness or inferred from dating methods
	has fall map which appears as an elongated footprint which depends on impact angle, airbursts, and impact velocity
	can have crater image
	has original mass which can over an order of magnitude greater than total mass of fragment(s) collected at the impact site
	has composition often minerals not found on Earth
	has relative abundance
	has total mass of finds 485755 kg
	has number of finds 1691
	has impact velocity when it hits the ground which is smaller than its velocity before it enters the atmosphere
	has impact angle
	has weather resistance which depends on its composition
	has monetary value large if the fall was witnessed
	often produce power outages and failures in electrical equipment due to EMP (electromagnetic pulse)
	can be associated with crater
	has origin meteoroid from interplanetary space or fragment dislodged from another planet, moon or planetesimal
	vaporizes completely if size is between 3 micrometers and 3 millimeters
	can survive fall if size is larger than 3 mm and velocity is less than 24 km per second
	can survive fall if it fragments because smaller pieces with less mass are more easily slowed by the atmosphere
	has ablative mass loss depending on composition, more friable stony meteoroids loses more mass than iron meteoroid
	has ablative mass loss directly proportional to initial velocity
	can shatter during impact phase
	can fragment during meteor phase
	has fragmentation probability during meteor phase which depends on composition
pallasite	has composition metallic iron plus olivine; core/mantle boundary samples
	has letter designation PAL
	has olivine content 35 to 85 % by volume
	has phosphate content 1 % or less by volume
	has chromite content 1 % or less by volume
	has olivine grain shape from angular fragments to rounded
	has olivine grain size typically one centimeter
	has formation cooling rate 2.5 to 4 degrees C per million years
	parent body radius 78 to 97 kilometers
	has total mass of finds 7207 kg
	has number of finds 33
rock	has part mineral
	has texture
	has genesis
stony iron meteorite	has distinguishing feature mixture of iron-nickel alloy and non-metallic minerals
metal-rich meteorite	has metal content higher than that of average solar system material
	has nickel content always greater than 4 %
igneous rock	has solidification mechanism
	has solidification timescale

Next main group pallasite: Esquel    Up: main group pallasite, meteorite find    Previous main group pallasite: Brahin